21310152 has 16 divisors (see below), whose sum is σ = 53275440. Its totient is φ = 7103376.

The previous prime is 21310147. The next prime is 21310181. The reversal of 21310152 is 25101312.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443938 + ... + 443985.

It is an arithmetic number, because the mean of its divisors is an integer number (3329715).

Almost surely, 2^21310152 is an apocalyptic number.

It is an amenable number.

21310152 is an abundant number, since it is smaller than the sum of its proper divisors (31965288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21310152 is a wasteful number, since it uses less digits than its factorization.

21310152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887932 (or 887928 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 21310152 is about 4616.2920184928. The cubic root of 21310152 is about 277.2440168395.

Adding to 21310152 its reverse (25101312), we get a palindrome (46411464).

The spelling of 21310152 in words is "twenty-one million, three hundred ten thousand, one hundred fifty-two".